Received for publication May 14, 1976. Supported in part by a grant from the Air Resources Board, Sacramento, CA (ARB 2-704). The citing of a trademark or product does not constitute a guarantee of the product by the University of California, the Department of Food and Agriculture, or the California Air Resources Board and does not imply its approval to the exclusion of other products which may be suitable.
Assistant Professor, UCD and Plant Pathologist, California Dept. of Food and Agriculture, SAPRC, Riverside, respectively. The authors wish to express their gratitude to P. K. Braegelmann and D. W. Baldwin of the California Department of Food and Agriculture for their assistance.
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